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Search: id:A133553
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| A133553 |
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E.g.f. satisfies: A(x) = x*(sec(exp(A(x))-1)). |
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+0
1
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| 0, 1, 0, 3, 12, 120, 1290, 17409, 277592, 5083659, 105675030, 2452220144, 62891640900, 1766131052829, 53900956145218, 1776400037307315, 62874491729108656, 2378684861565934468, 95790461019732936558
(list; graph; listen)
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OFFSET
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0,4
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MAPLE
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A:= proc(n) option remember; if n=0 then 0 else convert (series (x* (sec (exp(A(n-1))-1)), x=0, n+1), polynom) fi end: a:= n-> coeff (A(n), x, n)*n!: seq (a(n), n=0..24);
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CROSSREFS
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Sequence in context: A119649 A009254 A133987 this_sequence A010571 A067124 A124153
Adjacent sequences: A133550 A133551 A133552 this_sequence A133554 A133555 A133556
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KEYWORD
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nonn
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AUTHOR
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Alois P. Heinz (heinz(AT)hs-heilbronn.de), Aug 27 2008
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